| Abstract Scope |
Hybrid halide perovskites and related metal halides offer rich opportunities for optoelectronics, yet their performance is strongly governed by synthetic control over phase formation, interfaces, and defects. This talk presents our recent development of in situ organic cation chemistry as a platform for engineering functional halide materials. Using N-methylformamide-based solvent-assisted conversion, the reaction medium acts as both solvent and methylammonium source, enabling direct formation of hybrid metal halides and heterostructures. We demonstrate MAPbX₃-PbS heterostructures formed through thiocyanate-driven sulfurization, where temperature, halide identity, acid concentration, and precursor chemistry control phase purity, morphology, and interfacial architecture. We further extend this strategy to MoS₂-MAPbBr₃ photodetectors and low-dimensional Mn-, Cu-, and Bi-based metal halides, linking chemical design to trap suppression, carrier dynamics, photoluminescence, and photoresponse. Overall, this work establishes in situ organic cation chemistry as a versatile route to engineered hybrid halide materials and interfaces. |